Variable-speed motor.



C. ENDOBF, 1n.

VARIABLE SPEED MOTOR. APPLICATION FILED APR. 22, 1915.

2 SHEETSSHEET I.

Patented A r. 29, 1919.

WJZgEEEES C. ENDORF,J R- VARIABLE SPE E' D MOTOR. APPLICATION FILED APR. 22, 1915.

2 SHEETS-SHEET Z.

Patented Apr. 29, 1919.

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Specification Letters Patent. Patented Apr. 29, 1919.

Application and April 2a, 1915. Serial m. 23,005.

To all wkom itmay concern:

Be it known that I, CHARLES ENDORF, J r., v a citizen of the United States, and a resident of the city of Chicago, in the county of 5 Cook and State of Illinois, have invented certain new and useful Im rovements in Variable-Speed Motors; an I do hereby declare that the following is a full, clear, and exact description of the same, reference being'had to,the. accompan ing drawings, and to the numerals of reterence'marked thereon, which form a part of, this specification. I f

This invention relates to an improved ty e of motor capable of eat variations in speed by merely adjusting the position of one of the brushes, thus particularly adapting the motor for use on small machines such applicators, and the like, al-I- course, the principles involved larger type; j It is an object therefore of this invention as vibrators, though, of may be applied to machines 0 to-construct a motor'with one brush thereof maaie adjustable and with theconstruction an such that by adjusting the movable brush into various positions with respect to the 3 other stationary brush, a great range of l speed ofthe'motor It is also an important object of this invention to construct a variab e speed motor provided with a novel armature, each slot thereof containingtwo separate coils-and 5 with the various inner outer coils in the and respective slots of the armature inter-con 4t nected in a novel manner with the commutator segments, so that by use of one stationary and one ad'ustable brush the speed of the motor may varied by changing the relaftion of the brushes.

lo It is furthermore all-Object of this inven association of the field and armature.

speed is obtained with minimum sparking tion to construct a variable speed universal motor (for direct or for alternating current) embracing an armature of novel construction, the respective slots therein each containing two independent coils with said coils interconnected with the commutator segments in a novel, manner, and with brushes, one stationary and one adjustable, the adjustable brush novel contact means and acting when shifted to change the speed of the motor.

It is finally an object of this invention to construct a simple typeof variable speed universal motor, the speed of rotation of which may be changedthroughout a Wide range by merely shifting one brush thereof.

The invention (in a preferred form) is illustrated in the drawings and described in the accompanying specification. I

- In the drawings: Figure'l is a side elevation of a vibrator equipped with a. motor'embodying the principles of my invention, and provided with being provided with a means on the exterior thereof foradjusting .the position of a brush of the motor.

Fig. 2 is a fragmentary view taken on line 2-2 of Fi 1, with parts broken away and showing t e end casing cover or cap removed.

Fig. 3 an end view of the motor detached from the casin and showing an adjusted position of theimush in dotted lines.

Fig. 4 is a line 4-4 of Fig. 3.

Fig. 5 is a development view of the armature and commutator showing the connections of .the winding.

fragmentary detail view partly in section and partly in elevation, taken 'on Fig. 6 is a diagrammatic end view of the armature showing the connections of the armature coils to the commutator so cute.

Fig. 7 is a diagrammatic sketch of t 0 motor connections.

As shown on the drawin Referri first to the ge velopment view shown in ig. 5 ,the respective slots of the armature are denoted by the reference numerals 1 to 12 inclusive, and the corresponding, commutator segments by the reference numerals 1, to 12, inclusive. The light ence characters 7, 8 9", 10", 11 and 12".

As clearly shown in Figs. 5 and 6, the inner coil 1", is wound in the slots 1 and 8, and the outer coil- 8", thereover, in the same slots.

Similarly the inner coil 2, and outer coil 7", are disposed in the slots 2 and 7 the coils 3 -and 10", in the slots 3 and 10, the coils l and 9", in the slots 4 and 9, the coils 5 and 12 in the slots 5 and 12, the coils 6 and 11, in the slots 6 and 11. The synunetrical arrangement of the coils is evident by reference to Fig. 6, the coils progressing around the armature slots by pairs.

The inner coils 1", 2 3*, P, 5", and 6, are connected tc a pair of adjacent commutator segments 1*, 2, 3 4:, 5 and 6, as clearly shown in Figs. 5 and 6, and also connected to said commutator segments are the outer coils in the adjacent slots, 2'. 6., coil 7 being connected to the commutator segments 1 and 2, coil 9 being connectedbetween the commutator segments 3 and 4, coil 11", between the commutator segments 5 and 6, coil 8", between the commutator segments 7 and 8 coil 10*, between commutator segments 9 and 10, and coil 12, being connected between the commutator segments 11 and 12. It is apparent, therefore, that the inner coil of one slot is connected to the' same commutator segment as the outer coil of the next adjacent slot.

. Referring to Figs. 1 to 4 inclusive, the reference numeral 13, denotes a cylindrical shell, which, together with metal end cap members 14 and 15, respectively, affords a casin within which the motor is. inclosed. Attac ed to the cylindrical member 13, is a hollow handle 16, through which a cable 17 carrying the leads to the motor, is drawn. The two poles or field coils of the motor are denoted respectively by the reference Im merals 18 and 19, being rigidly secured on a built up laminated metal frame 20, and screwed or bolted to the end of said frame, is an end hearing bracket 21, for the armature shaft 22, at the commutator end of the armature, and a bushing 23, is threaded into said bracket 21, to afford a suitable'bearing for the end of said commutator shaft.

Secured on said bushingbetween the outer surface of the bracket 21, and a flange 24, provided on said bushing is a stationary arm 25, m which is movably mounted in a well known manner a. sprin impelled brush 26. Also mounted upon the ushing 23, adjacent said arm 25, 1s a similarly constructed, but pivotally mounted arm 27,'which carries a spring impelled brush 28, bearing upon the commutator of the motor.

The leads of the motor contained within the cable 17, as shownin Fig. 3, are drawnupwardly within the shell 13, andare denoted respectively by the reference numerals 29 and 30, the lead 29, being connected into the field coil 19, and the lead 30, being conbrush 28, in all positions of adjustment of the brush holder arm 27.

A lead 34, from the field coil 18, is connected to said conductor 33, on the insulating block 32, so that it is apparent therefore that the respective field coils of the poles of the motor are in series through the brushes with the armature.

For the purpose of moving the brush carrying arm 27, into various positions an actuating finger piece orshort handle 35, is threaded into the outer end of said arm, and projects througlr a slot provided in the lower side of theiend cap 14, as clearly shown in Fig. 1, for convenient actuation of the brush from the exterior of the device.

The operation isithought to be obvious from the description However, in order to vary the speed of the motor the o erator holding the vibrator by the ban e 16, merely adjusts the movable brush by means of the finger actuating piece 35, into anyone of its posltions to vary the speed of the motor as desired- The armature, referring to Fig. 3, rotate s in a clockwise direction, and

moving the brush into the dotted lineposition at the right of the figure, serves to decrease the speed of the motor, whereas adjustment of the brush toward the left, or in the direction of rotation of the armature serves to increase the speed of rotation thereof. .Due to the construction of the motor which is of a universal type, it is well adapted for use both on alternating and direct current circuits.

I am aware that details of construction may be varied without departing from the principles of this invention, and I therefore 1,801,032 v I a commutator end thereof, a bushing threaded into said bracket to afiord a bearing for said tions of adjustment, said movable brush 10 when adjusted serving "to vary the speed of rotation of the armature.

In testimony whereof I have hereunto subscribed my-name in the presence of a subscribing witness.

CHAS. ENDORF, JR.

Witness:

CHARLES W. HILLS, Jr. 

